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The symptoms manifest as sudden collapse, rigidity of the body, locked jaw with inability to speak, or trembling of the four limbs, cold extremities and body, absence of sweat, aversion to cold after regaining consciousness, or fever, or no fever, with a deep, fine, wiry, and tight pulse, accompanied by abdominal pain. This shares the same principle as the direct invasion of the Three Yin Meridians (Three Yin Channels) by cold pathogenic factors in *Shanghan Lun* (Treatise on Cold Damage), though it does not reach the severity of sudden collapse. Treatment should first employ Suhe Xiang Wan (Styrax Pills) mixed with wine, followed by Wuji San (Five Accumulations Powder) with one qian of Xiangfu (Cyperus Rhizome) and a small amount of Shexiang (Musk). For severe cases, Jiangfu Tang (Ginger and Aconite Decoction) is used. If the patient gradually revives, the body warms up, and speech resumes slightly, inquire about other symptoms. If due to cold, the pulse is slow and tight; if complicated by qi stagnation with a surging pulse and stabbing pain, Fuzi Lizhong Tang (Aconite Pill to Regulate the Middle) with five fen of Muxiang (Vladimiria Root) is added; if complicated by wind with a floating pulse and dizziness, one qian of Fangfeng (Saposhnikovia Root) is added; if complicated by dampness with a soggy pulse, swelling, fullness, and pain, one qian of Baizhu (Atractylodes Macrocephala Rhizome) is added. For tendon and vessel tension, one qian of Mugua (Chaenomeles Fruit) is added. For joint pain, one qian of Gui (Cinnamon Twig) is added. Dantian Acupoint (CV-4) may also be moxibusted, with more sessions being preferable. Generally, cold invading the skin causes edema (as seen in frostbite swelling); cold invading the muscles causes heaviness, swelling, and fluid accumulation (due to impaired blood circulation), leading to splitting pain, which may occur in the limbs, chest and hypochondrium, shins and back, or lower abdomen radiating to the testicles (initially, the whole body suffers from cold, but later the pathogen concentrates in one area, entering where there is deficiency). It may transmit via meridians to the membrane source of the zang-fu organs, causing heart and abdominal pain, or invade the zang-fu directly, resulting in excruciating pain leading to unconsciousness. Cold invading sinews and bones causes spasms and bone pain with limited flexion and extension. Cold entering the fu and zang organs leads to death. Treatment must assess the severity. For severe cases, use Fuzi Lizhong Tang; add Mahuang (Ephedra Herb) and Xixin (Asarum Root) for no sweat; add Dingxiang (Clove) and Wuzhuyu (Evodia Fruit) for vomiting; add Sheng Chuanwu (Raw Radix Aconiti Lateralis Preparata) for yin toxicity; add Renshen (Ginseng Root) for a faint pulse nearly imperceptible. For mild cases, use Huanjin Zhengqi San (Golden Exchange Upright Qi Powder) with Fuzi, or Wuji San. For umbilical abdominal pain, white lips, cyanotic nails, and cold extremities, use Fuzi Lizhong Tang or Jiangfu Tang. If cold enters the Liver, add Mugua; if it enters the Lung, add Sangbaipi (Mulberry Root Bark); if it enters the Spleen, add Baizhu; if it enters the Heart, add Fuling (Poria). Grind each of Shexiang, Banxia (Pinellia Tuber), and Zaojiao (Gleditsia Sinensis Spine) two and a half qian into powder, fill the navel with it, cover with sliced fresh ginger, and moxibust until the hands and feet warm up, or moxibust Dantian Acupoint. Cases of cold extremities and abdominal colic caused by sexual intercourse are treated similarly. Do not let frozen individuals approach fire, as this forces cold into the heart and causes death. In northern regions, if frozen hands and feet are bathed in hot water or roasted by fire, the joints may detach. They must be rubbed slowly until warmth returns, or alternatively rubbed with snow to draw out the cold; recovery occurs when qi flows freely and warmth returns. This illustrates the principle: when frozen stiff like ice, sudden heat causes the melted part to separate from the unmelted part, leading to detachment. Furthermore, water seeks moisture, and fire seeks dryness. The cold on the skin is rejected by internal yang, which originally wishes to exit but lacks guidance. Rubbing with snow uses cold to attract cold, allowing it to adhere externally, thereby enabling internal yang to extend and restore warmth.